OPTIMIZATION OF PROPERTIES IN TWO HIGH STRENGTH STAINLESS STEELS

Abstract

It was found possible to increase the strength and toughness of two high-strength stainless steels, AFC 77 and AFC 260, by austenitizing at higher- than-normal temperatures that are in the range where both austenite and delta ferrite are stable. The delta ferrite is then removed by isothermal transformation in the range 1800 to 2000F. This technique results in a greater solution of carbides and intermetallic particles and consequently in a greater amount of retained austenite than is possible at austenitizing temperatures below the delta-ferrite range. In addition, the technique permits optimum mechanical properties to be obtained over a wider compositional range.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1970
Accession Number
AD0711608

Entities

People

  • Donald Webster

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airplanes
  • Corrosion
  • Corrosion Resistance
  • Grain Size
  • Heat Treatment
  • High Temperature
  • Materials
  • Mechanical Properties
  • Particles
  • Resistance
  • Stainless Steel
  • Steel
  • Stress Corrosion
  • Tempering
  • Tensile Properties
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.